Spool for adhesive tape



Sept. 18, 1934. w c. L s 1,973,771-

SPOOL FOR ADHESIVE TAPE Filed Oct. 13. 1950 Patented Sept. 18, 1934UNITED STATES PATENT OFFICE SPOOL FOR ADHESIVE TAPE Wallace 0. Mills,Rockford, Ill., assignor to J. L.

Clark Manufacturing Co Rockford, 111., a corporation of Illinois Theinvention pertains to spools for containing adhesive plaster or the likeand has especial reference to a spool of small size constructed topermit of the application of the heads of -the spool to ametallictubular core after the adhesive plaster has been applied to thecore.

The primary object of the invention is to provide an improvedconstruction facilitating the application of the heads to the core whileinsuring that'the heads shall be firmly held in position.

A further object is to provide an improved core for spools formed from afiat sheet of metal and embodying an improved method of interlocking theedges of the sheet at the extreme ends of the core.

Another object is to provide in a spool of this character a mode ofconnecting the heads of the ends of the tubular body such that the headsImay be spaced from the ends of the roll of adhesive plaster carried bythe body, thus permitting of the free and unrestricted unwinding of thetape from the spool. V

A general object is to provide a spool construction which is simple incharacter, capable of economical manufacture, and presenting a neat andattractive appearance.

In the accompanying drawing:

Figure 1 is a central longitudinal sectional:

view illustrating one embodiment of my invention, one of the heads beingshown applied to the core and the other in position for assembly.

Fig. 2 is an end view of the core. Fig. 3 is a plan view illustratingthe blank Jfrom which the core is formed.

Fig. 4 is a fragmentary sectional view taken on line 44 of Fig. 1 but onan enlarged scale,

and illustrating the manner of connecting the meeting edges of the sheetforming the core.

Fig. 5 is an elevational view of a core showing a diiierent embodimentof the invention.

Fig. 6 is an end view of the core shown in Fig. 5.

Fig. '7 is a plan view of the blank from which the core Figs. 5 and 6 isformed.

Referring first to Figs. 1 to 4, 8 designates generally a tubular corehaving applied thereto a roll 9 of adhesive plaster in tape form. At

opposite ends of the core are inturned curved portions, herein in theform of curls 10 of substantially circular cross section with whichanchoring portions 11 on heads 12 are adapted to engage frictionally tohold the heads in position on the core.

The heads 12 are formed from flat metallic disks having peripheralstrengthening curls 13, and each has a centrally depressed axial portion or annulus in the form of an annular flange constituting theanchoring portions 11.

The core 8 is especially constructed to prevent expansion thereof uponthe insertion of the annulus 11, and this is accomplished in the presentinstance by the construction more especially illustrated in Figs. 3 and4. Thus the blank from which the core is formed, is serrated alongopposite side edges to provide a row of teeth 14 of which the end teethare spaced from the adjacent teeth to form end lugs 14: and 14 Thespacing of these lugs from the adjacent teeth is such as to form notches14. The length of the blank is such that the ends thereof may beoverlapped, as shown in Fig. 4, a sufficient distance to permit thereception of the end lugs on the overlapping end of the blank into thenotches 14 at the opposite end thereof when the lugs are curledinwardly. Thus as shownin Fig. 3, the end lugs l4 on the overlapping endportion of the blank are engaged in notches 14 atthe'opposite underlyingend portion of the blank. Such inward curling of the lugs isaccomplished at the same time that the serrations 14 are curled inwardlyto form the curls 10,. the lugs being disposed in substantially the samecircularplane as the serrations l4 and thus interlocked.

Preferably the width of each of the notches 14 at its base is somewhatnarrower than the widthof the base of the lug received thereby so thatthe latter engages the sloping side walls of the notch and thus avoidsany looseness in the interengagement after the curling operation.

In Figs. 5, 6 and. '7, I have illustrated another specific mode offorming the core. In this instance the ends of'the completed core arenot curled inwardly so that the blank is provided only with lugs 15 andnotches 16 which when the blank is rolledinto tubular form, as shown inFig. 5, with its ends overlapping, may be bent into interengagingrelation. As in the previous embodiment the lugs are carried by theoverlapping end portion of the blank and when folded inwardly areadapted to engage with the notches in the underlying portion.

It will be observed that in the above embodiments of the invention, thecore is positively held against expansion at the ends thereof, so thatwhen the heads are applied to the end of the core, each annulus 11 uponbeing forced into the core may engage therewith with a snug or drivingfit and thus be held firmly in position.

be held against expansion. A further advantage resides in the embodimentshown in Figs. 1 to 4: wherein the ends of the core are curled inwardly.Thus the interlocking lugs and notches do not add appreciably to thebulk'of the metal at the joint since the lugs while engaging in thenotches are disposed in substantially the same plane as the inturnedserrations or teeth 14. To permit of the unrestricted unwinding of thetape from the spool after the heads are applied thereto,- the latter areconstructed to provide spaces between them and the ends of the rolls 9.This is accomplished by forming an axially offset'portion 17 in'eachheadat thebase of the annular anchoring flange-'11.

I claim as my invention: 1 1. A spool comprising a tubular metallic coreand a head adapted to be secured on one end of the core and having anannulus projecting axially thereof for insertion intosaid end of thecore, said core being formed from a sheet of metalbent into tubular formwith portions overlapping at said end of the core, said overlappingportions being shaped to, provide respectively, a notch opening endwiseof the core and ajlug bent into interengaging relation with the notchwhereby to hold the end of the core against expansion.

2. A spool comprising a core formed from a sheet of metal having a,serrated'edgepsaid. sheet being bent into tubular'fo-rm with its opposite ends overlapping and having atitsrespective ends a notch and alug, said serrated edgebeing curled inwardly: together with said lugwith the lug interengagingin said notch whereby to hold'said end-of thecorezagainst expansion, and a head having an annulus projecting axiallythereof andinserted into saidend of the core in holding engagementtherewith.

3; A tubular core for adhesive -plaster formed .from a sheet of metalhaving a serrated'edge portion and bent'into tubular form, said serratededge pcrtion being bent to forma rounded end for the core, and theoppositeends of. saidserrated edge portion being. constructed to providean interlocking joint for of the core.

4. A tubular core for adhesive plaster or the like, said core beingformed from a sheet of metal having at one edge a. row of teeth with one.of said teeth near one end of the sheet spaced from its adjacent toothso as to provide a notch, one of the teeth at the opposite end of thesheet forming alug'which isbent into engagement with said notch, and.the intermediate teeth being bent to provide a-rounded end for the core.

said rounded end 5. A tubular core for adhesive plaster rolls comprisinga fiat sheet of metal bent into tubular form with its end portionsoverlapping, the edge of said sheet forming one end of the core beingcurved inwardly into the core, and the overlapping end portions of thesheet being provided-respectively with a-lug bent inwardly toether. withsaid curved edge portion of the sheet and a notch for receiving saidlug.

6. A'metallic core for adhesive plaster rolls and the like comprising asheet of metal having its opposite side edges serrated and. bent intotubular form with said serrated edge portions curled inwardly intothe-ends of the core, said serrated portions terminating short of theends of the sheet, and said ends of the sheet having respectively anotch and a lug bent inwardly into engagement with the notch.

7. A metallic core for adhesive plaster rolls and the like comprising aflat sheet of metal bent into tubular form, said ends of the sheethaving-respectively a notch and alug bent inwardly into engagement withthe notch, and said notch being of a width gradually decreas me; towardsits base and said lug being. greater than the width of the base of thenotch.

' 8. A spool comprising 'a tubular member formed from a flat sheet ofmetal to provide a metallic core for a roll of adhesive tape or thelike, said core having its opposite ends bent inwardly, and heads foropposite ends of the core, each comprising a disk formed of sheet metaland having a central portion pressed axially thereof to form an integralannulus With a terminal portion adaptedto engage With one of saidinturned ends of the core, each of said heads being disposed in a planeofiset outwardly from the annulus to provide a space between the headand the adhesive plaster on the core. 9. A metallic core for adhesiveplaster-spools, formed from'a flat sheet of metal bent into tubular formwith overlapping end portions curled inwardly and axially of the coreinto interlocking relation to hold said end portions against'expansion;

=10. A spool comprising ahead having-an annulus projecting axiallythereof, and a core formed from a sheet of metal bent into tubular formand having at one extreme end overlapping edge portions bent in adirection axially of the core into interlocking relation to preventexpansion of the core, said annulus being forced into holding engagementwith said extreme end of the core.

11. A spool comprising a tubular metallic core

